I don’t know where you get this. I am definitely not the person who should be the object of your concern. Despite my refusal to have “cis” foisted upon me.
As I said, I address and treat everyone as they CHOOSE to present themselves to me. If the person informs me that they prefer to be treated as something other than the apparent gender, then of course I am going to happily comply. If they are obviously trans, I am going to automatically default to the terminology that works with what they appear to be transing TO, on the assumption that that is their preference. If they inform me otherwise, I will comply. Their exterior appearance does not necessarily have anything to do with it. It is how they choose to define themselves that matters.
Really, with the exception of my refusal to be lumbered with “cis,” I am the poster child for trans dignity and acceptance.